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This work reports an experimental investigation of the magneto-elasticcoupling and polarization character of magnetic phases of the orthorhombicEu1-xYxMnO3 system at low temperatures. The temperature dependence of thepolarization reversal curves clearly reveals the existence of a reentrantimproper ferroelectric phase for x = 0.2 and 0.3. Although a ferroelectricphase is also stable for x = 0.4, we have no experimental evidence that itvanishing at finite temperatures. From these results and those obtained fromother experimental techniques, the corresponding (x,T) phase diagram wastraced, yet yielding significant differences with regard to previous reports.An expressive magneto-elastic coupling is revealed by changes observed in bothMn-O bond lengths and Mn-O1-Mn bond angle at the magnetic phase transitions,obtained by temperature dependence of synchrotron x-ray diffractionexperiments. Furthermore, signatures of the lattice deformations across themagnetic phase transitions were evidenced by anomalies in the temperaturedependence of the lattice mode involving rotations of the MnO6 octahedra. Theseanomalies confirm the important role of the spin-phonon coupling in thesematerials.

Strong magneto-elastic coupling and polar properties in orthorhombic Eu1-xYxMnO3 manganite